Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 8,559	$ (20,223)	$ 15,967	$ (26,175)
Shares used in basic Net income (loss) per share (in shares)	132,206	124,843	131,599	124,460
Dilutive effect of stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition (in shares)	5,015	0	4,534	0
Shares used in diluted Net income (loss) per share (in shares)	137,221	124,843	136,133	124,460
Basic Net income (loss) per share (in usd per share)	$ 0.06	$ (0.16)	$ 0.12	$ (0.21)
Diluted Net income (loss) per share (in usd per share)	$ 0.06	$ (0.16)	$ 0.12	$ (0.21)
Stock options, RSUs, ESPP shares, and equity awards with a market condition or performance condition excluded as they are antidilutive	73	9,169	210	9,376